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21. Such enormous numbers used to discourage us and cause us to dismiss the possibility of making a machine with human-like ability, but now that we have grown used to moving forward at such a pace we can be less sure.

22. Further ahead, by a combination of the great wealth this new age will bring and the technology it will provide, the construction of a vast, man-created world in space, home to thousands or millions of people, will be within our power.

23. It is also possible for a student to move between one university and another during his degree course, though this is not in fact done as a regular practice.

24. A rapid means of long-distance transportation became a necessity for the United States as settlement spread ever farther westward.

25. In such a case, it is usually settled in the consumer’s favor, assuming he or she has a just claim.

26. The number of tickets _____ will be determined by the size of the stadium. A. adaptable B. acceptable C. advisable D. available

27. Too many hotels have been built and this has _____ prices, making holidays cheaper. A. cut short B. cut out C. cut off D. cut down

28. He is a very honest official and never _____ any gifts from the people who sought his help. A. accepted B. received C. took up D. excepted

29. He was not _____ to the club because he wasn't a member. A. allowed B. admitted C. permitted D. approved

30. Although he doesn't like that law, he will _____ with it. A. confine B. conform C. comply D. contend

At the beginning of this century, medical scientists made an interesting discovery; we are built not just of flesh and blood but also of time. They were 1to show that we all have “a body clock” 2us, which controls the 3and fall of our body energies, 4us different from one day one to the next.

The 5of “a body clock” should not be too 6since the lives of most living things are controlled 7the 24 hour night-and-day cycle. We feel 8and fall asleep at night and become 9and energetic during the day. If the 24 hour-cycle is 10, most people experience unpleasant 11. F0r example, people who are not 12to w0rking at night can find that 13of sleep causes them to 14badly at w0rk.

15the daily cycle of sleeping and 16 , we also have other cycles which 17longer than one day. Most of us would 18that we feel good on some days and not so good on19; sometimes our ideas seem to flow and at other times, they 20do not exist.

Antarctica has actually become a kind of space station – a unique observation post for detecting important changes in the world’s environment. Remote from major sources of pollution and the complex geological and ecological systems that prevail elsewhere, Antarctica makes possible scientific measurements that are often sharper and easier to interpret than those made in other parts of the world.

Growing numbers of scientists therefore see Antarctica as a distant-early-warning sensor, where potentially dangerous global trends may be spotted before they show up to the north. One promising field of investigation is glaciology. Scholars from the United States, Switzerland, and France are pursuing seven separate but related projects that reflect their concern for the health of the West Antarctic Ice Sheet – a concern they believe the world at large should share.

The Transantarctic Mountain, some of them more than 14,000 feet high, divide the continent into two very different regions. The part of the continent to the “east” of the mountains is a high plateau covered by an ice sheet nearly two miles thick. “West” of the mountain, the half of the continent south of the Americas is also covered by an ice sheet, but there the ice rests on rock that is mostly well below sea level. If the West Antarctic Ice Sheet disappeared, the western part of the continent would be reduced to a sparse cluster of island.

While ice and snow are obviously central to many environmental experiments, others focus on the mysterious “dry valley” of Antarctica, valleys that contain little ice or snow even in the depths of winter. Slashed through the mountains of southern Victoria Land, these valleys once held enormous glaciers that descended 9,000 feet from the polar plateau to the Ross Sea. Now the glaciers are gone, perhaps a casualty of the global warming trend during the 10,000 years since the ice age. Even the snow that falls in the dry valleys is blasted out by vicious winds that roars down from the polar plateau to the sea. Left bare are spectacular gorges, rippled fields of sand dunes, clusters of boulders sculptured into fantastic shapes by 100-mile-an-hour winds, and an aura of extraterrestrial desolation.

Despite the unearthly aspect of the dry valleys, some scientists believe they may carry a message of hope of the verdant parts of the earth. Some scientists believe that in some cases the dry valleys may soak up pollutants faster than pollutants enter them.

1.What is the best title for this passage?[A] Antarctica and environmental Problems.[B] Antarctica: Earth’s Early-Warning station.[C] Antarctica: a Unique Observation Post.[D] Antarctica: a Mysterious Place.

2.What would the result be if the West Antarctic Ice Sheet disappeared?[A] The western part of the continent would be disappeared.[B] The western part of the continent would be reduced.[C] The western part of the continent would become scattered Islands.[D] The western part of the continent would be reduced to a cluster of Islands.

3.Why are the Dry Valleys left bare?[A] Vicious wind blasts the snow away.[B] It rarely snows.[C] Because of the global warming trend and fierce wind.[D] Sand dunes.

4.Which of the following is true?[A] The “Dry Valleys” have nothing left inside.[B] The “Dry Valleys” never held glaciers.[C] The “Dry Valleys” may carry a message of hope for the verdant.[D] The “Dry Valleys” are useless to scientists.

难句译注

1.Growing numbers of scientists therefore see Antarctica as a distant-early waning sensor, where potentially dangerous global trends may be spotted before they show up to the north.【结构简析】see … as 把……看作。Where定从修饰Antarctic。【参考译文】因此，越来越多的科学家把南极洲视为一个远距离早期报警敏感器，在那里地球许多潜在的危险动向早在它们出现于北方以前就能发现。

2.The part of the continent to the “east” of the mountain东指的使印度正南的这一部分。或山移动的那部分洲。

[答案] D. available. [注释] available. (=capable of being used; that may be obtained) 可用的, 有效的, 可得到的。例如：1) There are no doctors available in the remote areas. (在边远地区没有大夫。) 2) There tickets are available for on month. (这些票有效期一个月。)acceptable 可以接受的：None of the suggestions was acceptable. advisable 明智的, 可取的, 适当的：I think it advisable that he be assigned to the job. (我认为指派他干这项工作是可取的。) adaptable 能适应的：He is an adaptable man and will soon learn the new work.

[答案] B. admitted.[注释] admit sb. to (=allow sb. or sth. to enter; let in) 允许某人某物进入; 让......进入：1) Children are not admitted. (儿童免进。) Only one hundred boys are admitted to the school the school every year. (这所学校每年只收100名男生。) admit (=acknowledge; confess) 承认, 供认：1) We have to admit that he is a highly competent man. (我们不得不承认他是一位能力很强的人。) 2) The thief admitted his crime. 3) She admitted having read the letter, 4) I admit breaking the window. 注意admit后可接动名词的一般式或完成式。5) We must admit the task to be difficult。注意admit也可以接复合结构。allow和permit后均可接sb. to do sth., 故不合本题题意。approve sth. 批准; approve of doing sth. (=think well of) 赞成, 赞许：1) I am afraid they won't approve of your going there. (恐怕他们不会赞成你去那里的。) 2) I don't approve of your way of looking at things. (我不赞同你看待事情的方法。)